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A force 2bar(i)+bar(j)-bar(k) Newton act...

A force `2bar(i)+bar(j)-bar(k)` Newton acts on a body which is initially at rest . At the end of 20 seconds the velocity of the body is `4bar(i)+2bar(j)-2bar(k)` m/s . What is the mass of the body ?

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`m=10 kg`
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